146 FLORIDA GEOLOGICAL SURVEY—FOURTH ANNUAL REPORT. 
MADISON COUNTY. 
LOCATION AND SURFACE FEATURES. 
Madison county extends north to the Georgia-Florida line. Its 
eastern boundary is formed by the Withlacoochee and Suwannee 
rivers which separate it from Hamilton and Suwannee counties. 
On the south it is bounded by Lafayette and Taylor counties, and 
on the west by Taylor and Jefferson counties. The Aucilla River 
makes up a part of this western boundary. The total area is 693 
square miles or 443,520 acres. 
The western half of this county consists of the rolling red sandy 
clay type of soils resembling the contiguous parts of Jefferson 
county. The eastern half is gently undulating. This section may be 
correlated with the western parts of Hamilton and Suwannee 
counties. In the vicinity of Lee and along the rivers in this eastern 
section limestone sinks and springs occur. The southern part of 
the county is more level. The principal growth on the red hills 
consists of hardwood timber while in more sandy regions, the long 
leaf pine is the prevailing tree. Southward in the fiatwoods part 
of the county the prevailing growth is long le,af pine. 
ELEVATIONS. 
The following elevations are recorded at stations along the Sea¬ 
board Air Line Railway which crosses the central part of the county 
from east to west: Ellaville (near Suwannee River) 64 feet; Lee 
96 feet; West Farm 107 feet; Madison 133 feet; Greenville 106 
feet. No records along the other railroad lines in this county have 
been obtained. 
DRAINAGE. 
The Aucilla River on the west and the Withlacoochee and 
Suwannee rivers on the east make up the drainage system of the 
county. The intervening country slopes to these two rivers which 
carry off a great portion of the surface drainage. In the eastern 
part of the county many sink holes occur. The rivers here have 
also cut their channels into the underlying limestone. The drainage 
is in i>art through these sink holes into the limestones. 
ARTESIAN WELLS. 
A number of wells have been drilled in Madison county ranging 
